Database Management Systems Mcqs

Page No. 78

Cross Product is a:


aUnary Operator

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bTernary Operator

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cBinary Operator

✓


dNot an operator

✖


View Answer Binary Operator

In E-R Diagram derived attribute are represented by


aEllipse

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bDashed ellipse

✓


cRectangle

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dTriangle

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View Answer Dashed ellipse

A primary key is combined with a foreign key creates


aParent-Child relation ship between the tables that connect them.

✓


bMany to many relationship between the tables that connect them.

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cNetwork model between the tables that connect them.

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dNone of the above.

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The physical location of a record is determined by a mathematical formula that transforms a file key into a record location is :


aB-Tree File

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bHashed File

✓


cIndexed File

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dSequential file

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View Answer Hashed File

A file manipulation command that extracts some of the records from a file is called


aSELECT

✓


bPROJECT

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cJOIN

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dPRODUCT

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View Answer SELECT

A data dictionary is a special file that contains:


aThe name of all fields in all files.

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bThe width of all fields in all files.

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cThe data type of all fields in all files.

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dAll of the above.

✓


View Answer All of the above.

NULL is


athe same as 0 for integer

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bthe same as blank for character

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cthe same as 0 for integer and blank for character

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dNot a value

✓


View Answer Not a value

Which of the following is a comparison operator in SQL?


a=

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bLIKE

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cBetween

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dALL

✓


View Answer ALL

The result of the UNION operation between R1 and R2 is a relation that includes


aall the tuples of R1

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ball the tuples of R2

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call the tuples of R1 and R2

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dall the tuples of R1 and R2 which have common columns

✓



Which are the two ways in which entities can participate in a relationship?


aPassive and active

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bTotal and partial

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cSimple and Complex

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dAll of the above

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View Answer Total and partial

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